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I tried running cargo run -- --dev after building. However i get this error 0: Invalid input: Error opening spec file dev: No such file or directory (os error 2).

I don't know rust and substrate however after slight debugging i found it to breaking at line https://github.com/paritytech/polkadot-sdk/blob/e38998801e433ecc569ff6d58d1d0aa80eaff771/polkadot/cli/src/command.rs#L149.

Variable named path is coming as dev. If i directly pass spec json path (polkadot/node/service/chain-specs/polkadot.json) in the above line then it is able to fetch the spec but gives error unable to find binary in paths /users/$NAME/blockchain/polkadot-sdk/target/debug and /usr/lib/polkadot.

Error 0: Worker binaries could not be found, make sure polkadot was built/installed correctly. If you ran with `cargo run`, please run `cargo build` first. Searched given workers path (None), polkadot binary path ("/Users/$NAME/blockchain/polkadot-sdk/target/debug"), and lib path (/usr/lib/polkadot), workers names: None.

However the binary is present in the first path atleast. I cannot directly run a binary after downloading as i need to make some code changes and plug it to polkadot js apps.

target folder screenshot

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  • Which binary do you want to run? (parachain-)node-template/polkadot?
    – Daan van der Plas
    Sep 18 at 10:23
  • @DaanvanderPlas Polkadot
    – Rajdeep Singh
    Sep 18 at 11:25

2 Answers 2

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You can also run the binary directly from the path if you have built the code using --release then the binary would be in /target/release/"bianry_name" and you can run it via the command ./target/release/"bianry_name" --dev .

And if you didn't built the code in --release than you binary will be in /target/debug/"bianry_name" and you can run it through command ./target/debug/"bianry_name" --dev

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  • I have also tried that and it gives me this error Error: 0: Worker binaries could not be found, make sure polkadot was built/installed correctly. If you ran with `cargo run`, please run `cargo build` first. Searched given workers path (None), polkadot binary path ("/Users/rajdeepsingh/blockchain/polkadot-sdk/target/debug"), and lib path (/usr/lib/polkadot), workers names: None Have updated the original question with a screenshot of target folder and the binary exists
    – Rajdeep Singh
    Sep 19 at 5:20
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This was an ongoing issue raised in polkadot-sdk repo. Answered there, linking here

https://github.com/paritytech/polkadot-sdk/issues/1372#issuecomment-1725114216

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